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Discriminator output

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Revision as of 12:20, 15 December 2005 by Mikeag (talk | contribs)

The Discriminator output from a scanner is the raw, unfiltered signal that a scanner produces before it is sent to the audio stage for output through the speaker -- also called the "baseband audio." This discriminator source is required for applications such as Trunker, MTrunker, T4Win, and UniTrunker. Most scanners must have a simple modification made to them to output the discriminator audio output to the interfaces outlined on this page.

Note that for providing a signal for ACARS applications, a plug from an earphone or speaker output is all that's required. This is because ACARS runs at a much lower speed, and the discriminator is not involved where AM demodulation is involved.

  • See here for a list of discriminator output locations for many popular scanners - courtesy of Bill Cheek
  • See this document from Greg Knox regarding instructions on how to tap the discriminator output on the BC-895 Scanner. See this picture for the location of the discriminator output on the 895.
  • See Bill Cheeks SCANDATA.FAQ listed at the bottom of the page for detailed instructions on how to tap the discriminator in your scanner.
  • Here are a few more sources of discriminator tap information;